Flylinktech Professional Replacement Battery For Milwaukee 48-11-1828 M18 XC RED LITHIUM 18-Volt Lithium-ion Cordless Tool Battery M18 18v Battery for Milwaukee 48-11-1840 48-11-1815 48-11-1820 48-11-1840 M18 XC Red lithium 3.0 Ah extended run-time battery provides long run-time and battery life. Fit for Milwaukee M18,2601,2610,2611,2620, 2630,2650,49-24-0171,48-11-1815,48-11-1820,48-11-1840 Highest quality standards,Integrated microchip prevents overcharging & lengthens battery life. Built in high quality battery cells,No effect on the battery,Charging at any time.